Paper box



F. M. WADE.

PAPE R Box. APPLICATION FILED MAILIM I9I8.

1,328,935, Patented Jan. 27,1920.

avwentoz I provide the side walls,

'tongues 0;, adapted UNITED STATES PATENT. OFFICE.

FRANK M. WADE, OF WAUWA'IOSA, WISCONSIN, ASSIGNOR TO MILWAUKEE PAPER BOX COMPANY, OF MILWAUKEE, WISCONSIN, A CORPORATION OF WISCONSIN.

PAPER BOX.

Specification of Letters Patent.

Application filed March 14, 1918. Serial No. 222,434.

To all whom it may concern:

Be it known that I, FRANK M. WADE, a citizen of the United States, residing at the National Soldiers Home, in the town of Wauwatosa, county of Milwaukee, and State of Wisconsin, have invented new and useful Improvements in Pa er Boxes, of which the following is a speci cation.

My invention relates to improvements in paper boxes.

The object of my invention is to provide a form of box having interlocking end portions,and a partially open side portion provided with an interlocking cover flap, all composed of a single sheet or strip of card board, cut, creased and folded as hereinafter described.

A further object of my invention is to a knockdown box having permanently connected top, bottom and side walls, interlo king end walls, and an interlocking cover flap, which may be folded for shipment in the form of a fiat set of superposed cardboard strips, and reassembled in box form by a mere swinging adjustmentiof and by folding the end wall members inwardly and interlocking them in assembled relation.

, In the drawings Figure 1 illustrates my invention as it appears in knockdown form.

Fig. 2 is a view of the same as seen from the opposite side from.that illustrated in Fig. l.

Fig. 3 is a fragmentary view, showing the members composing the end wall, when parially adjusted, in assembled relation.

Fig. 4: is a perspective View of the box as it appears when set up ready for use.

Fig.5 is a cross section.

Like parts are identified by the same reference characters throughout the several views.

"A strip of paper, preferably cardboard, is subdivided by transverse crease lines into a cover flap A, side wall A, bottom wall B, side wall B, top wall' C, and connecting flap D, folded as best shown in sect1on,.in- Fig. 5, with the flap D gummed' to the inner surface of the wall A, and with the cover flap in position to. close the opening E in the top wall C, said flap having its margins contoured to form a set of corner to be received in suitable slits a, formed in the top wall A, near tongue two of its corners. The slits extend diagonally across the corners of the top wall A in a position to receive the tongues in interlocking relation. Inasmuch as the 'crease lines form flexible corner joints, it .is obvious that the side walls A, B, may be swung in Patented Jan. 27, 1920.

one direction to allow the top wall A to fold downwardly until it rests flat upon a portion of the bottom wall, and upon the side wall B, as shown in Figs. 1 and 2.

The end walls are composed of flaps projet-ted from the ends of the top, bottom and side walls, and adapted to be folded to positionsin which these members are interlocked with each other at each end of the box. A convenient method of forming these flaps is to provide the top wall A with flaps F at each end, having converging mar- F terminating in an interlocking gins The side walls A and B are provided at each end with projecting flaps G, the lower margins of which extend upwardly along curved lines Gr, continuing along oblique lines converging toward the top margin of the flap, as shown at g, and defining a tongue H adapted, when the flaps are folded lnwardly, to be received underneath the top flap F. The bottom wall is provided at each end with a projecting flap I, rectangular in form, and adapted to fill the end of the box when folded inwardly, this flap havingupper and lower margins, equal'in length to the width of the top wall A and bottom wall B, and its side margins 'being equal in length to side walls A and B.

the width of the The flap I is'provided with a transverse slit J having end extensions K leading upwardly in the wall toward the 'top' of the box, and preferably inwardly curved at L, thereby forming a flexible member M adapted to yield inwardly under pressure.

When the box is assembled in position for use, by swinging the side walls A and B to vertical position, the flaps I may be folded upwardly at each end of the box, and the flaps G formed inwardly against theflap- I, after which the cover flaps F may be swung downwardly across the tongues H, and the tongue 7 on the lie F inserted through the slit J, the member yielding sufiiciently to allow the flaps to'be thus interlocked without tearing.

The end flaps, when interlocked. as above described, will hold the box in. position. for

use, and the box may be opened by releasing paper boxes of the knock-down type. In

fact, it is possible to assemble my improved box in substantially the same time that it would require to remove an ordinary box from a shelf, sinoe the top, bottom, side walls and cover flap are permanently connected in an endless series, and merely require to be swung into the form of a rectangular receptacle, and the end flaps adjusted 1n position to provide a complete receptacle ready for use.

I claim:

1. A knock-down paper box, comprising a set of side, top and bottom walls perma- 1 nently connected in an endless series. all of said walls being provided with end flaps adapted, when folded, to constitute the end walls of the box, the bottom flap having a transverse slit and comprising an inner member of the wall, the top flap being provided with a tongue adapted to interlock in said slit, and the other two flaps having their lower margins cut away to allow their extremities to fold upon each other between the interlocking flaps above said slit.

2. A paper box comprising walls connected in an endless series, one of said walls having an extension constituting a cover flap, the adjacent wall having an opening adapted to be normallyclosed by said cover flap, an end flap upon each wall adapted to constitute an end wall of the box, one of said flaps having a transverse slit and comprising an inner member of the end wall, the opposite flap being-provided with a tongue adapted to interlock in said slit. the other two flaps being cut away permitting them to fold 

